Here's a thought, is it possible today to take these phonoautographs and scan and convert them to digital waveforms, as seen in most editing programs, and now reproduce sound from them, albeit low resolution?
If any survive, they could certainly be tried. However, lampblack on glass or paper would be rather fragile - and 147 years is a loooong time.
There are interesting images at http://www.phonautograph.com/ - including two of a recording. Judging from them, recognizable sound may not be forthcoming.
Mike -- mrichter@xxxxxxx http://www.mrichter.com/